ext4: add max_dir_size_kb mount option

Very large directories can cause significant performance problems, or
perhaps even invoke the OOM killer, if the process is running in a
highly constrained memory environment (whether it is VM's with a small
amount of memory or in a small memory cgroup).

So it is useful, in cloud server/data center environments, to be able
to set a filesystem-wide cap on the maximum size of a directory, to
ensure that directories never get larger than a sane size.  We do this
via a new mount option, max_dir_size_kb.  If there is an attempt to
grow the directory larger than max_dir_size_kb, the system call will
return ENOSPC instead.

Google-Bug-Id: 6863013

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

diff --git a/Documentation/filesystems/ext4.txt b/Documentation/filesystems/ext4.txt
index 1b7f9ac..104322b 100644 (file)
--- a/Documentation/filesystems/ext4.txt
+++ b/Documentation/filesystems/ext4.txt
@@ -375,6 +375,16 @@ dioread_nolock             locking. If the dioread_nolock option is specified
                        Because of the restrictions this options comprises
                        it is off by default (e.g. dioread_lock).
 
+max_dir_size_kb=n      This limits the size of directories so that any
+                       attempt to expand them beyond the specified
+                       limit in kilobytes will cause an ENOSPC error.
+                       This is useful in memory constrained
+                       environments, where a very large directory can
+                       cause severe performance problems or even
+                       provoke the Out Of Memory killer.  (For example,
+                       if there is only 512mb memory available, a 176mb
+                       directory may seriously cramp the system's style.)
+
 i_version              Enable 64-bit inode version support. This option is
                        off by default.
 

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index c3411d4..7c0841e 100644 (file)
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -1243,6 +1243,7 @@ struct ext4_sb_info {
        unsigned int s_mb_order2_reqs;
        unsigned int s_mb_group_prealloc;
        unsigned int s_max_writeback_mb_bump;
+       unsigned int s_max_dir_size_kb;
        /* where last allocation was done - for stream allocation */
        unsigned long s_mb_last_group;
        unsigned long s_mb_last_start;

diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 2a42cc0..7450ff0 100644 (file)
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -55,6 +55,13 @@ static struct buffer_head *ext4_append(handle_t *handle,
 {
        struct buffer_head *bh;
 
+       if (unlikely(EXT4_SB(inode->i_sb)->s_max_dir_size_kb &&
+                    ((inode->i_size >> 10) >=
+                     EXT4_SB(inode->i_sb)->s_max_dir_size_kb))) {
+               *err = -ENOSPC;
+               return NULL;
+       }
+
        *block = inode->i_size >> inode->i_sb->s_blocksize_bits;
 
        bh = ext4_bread(handle, inode, *block, 1, err);

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 5984989..5a97e59 100644 (file)
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1230,6 +1230,7 @@ enum {
        Opt_inode_readahead_blks, Opt_journal_ioprio,
        Opt_dioread_nolock, Opt_dioread_lock,
        Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
+       Opt_max_dir_size_kb,
 };
 
 static const match_table_t tokens = {
@@ -1303,6 +1304,7 @@ static const match_table_t tokens = {
        {Opt_init_itable, "init_itable=%u"},
        {Opt_init_itable, "init_itable"},
        {Opt_noinit_itable, "noinit_itable"},
+       {Opt_max_dir_size_kb, "max_dir_size_kb=%u"},
        {Opt_removed, "check=none"},    /* mount option from ext2/3 */
        {Opt_removed, "nocheck"},       /* mount option from ext2/3 */
        {Opt_removed, "reservation"},   /* mount option from ext2/3 */
@@ -1483,6 +1485,7 @@ static const struct mount_opts {
        {Opt_jqfmt_vfsold, QFMT_VFS_OLD, MOPT_QFMT},
        {Opt_jqfmt_vfsv0, QFMT_VFS_V0, MOPT_QFMT},
        {Opt_jqfmt_vfsv1, QFMT_VFS_V1, MOPT_QFMT},
+       {Opt_max_dir_size_kb, 0, MOPT_GTE0},
        {Opt_err, 0, 0}
 };
 
@@ -1598,6 +1601,8 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token,
                        if (!args->from)
                                arg = EXT4_DEF_LI_WAIT_MULT;
                        sbi->s_li_wait_mult = arg;
+               } else if (token == Opt_max_dir_size_kb) {
+                       sbi->s_max_dir_size_kb = arg;
                } else if (token == Opt_stripe) {
                        sbi->s_stripe = arg;
                } else if (m->flags & MOPT_DATAJ) {
@@ -1829,6 +1834,8 @@ static int _ext4_show_options(struct seq_file *seq, struct super_block *sb,
        if (nodefs || (test_opt(sb, INIT_INODE_TABLE) &&
                       (sbi->s_li_wait_mult != EXT4_DEF_LI_WAIT_MULT)))
                SEQ_OPTS_PRINT("init_itable=%u", sbi->s_li_wait_mult);
+       if (nodefs || sbi->s_max_dir_size_kb)
+               SEQ_OPTS_PRINT("max_dir_size_kb=%u", sbi->s_max_dir_size_kb);
 
        ext4_show_quota_options(seq, sb);
        return 0;